Apparatus for maturing and bleaching flour.



Patented June 27, 1916.

4 SHEETSSHEET I J'I'ILVTOR.

LUGAN. APPARATUS FOR MATURING AND BLEA CHING FLOUR.

APPLICATION FILED AUG-3.19M.

WITNESSES:

J. I. LOGAN.

APPARATUS FOR MATURING AND BLEACHING FLOUR.

APPLICATION FILED AUG. 3. 1914.

1 ,1 88,665 Patented June 27, 1916.

4 SHEETS-SHEET 2.

WI TN/iSlS/IS v y f [N VEN TOR.

.4 TTORNE YJZ J. l. LOGAN APPARATUS FOR MATURING AND BLEACHING FLOUR. APPLICATION FILED AUG-3.1914.

4 SHEETS-SHEET 3.

A TTORNEYLS- WITNESSES.-

Patented June 27, 1916.

Patented J nne 27, 1916.

4 SHEETS-SHEET 4- J. I. LOGAN. APPARATUS FOR MATURING AND BLEACHING FLOUR.

APPLICATION FRED AUG-3,1914- 1,188,665.

' [III/Ill A TTORNE Y! j N VEN TOR. B Y

M ITNESSES:

UNITED STATES PATENT OFFICE.

JOHN I. LOGAN, OF CHICAGO, ILLINOIS, ASSIGNOR TO INDUSTRIAL APPLIANCE COMPANY, A CORPORATION OF WEST VIRGINIA.

Specification of Letters Patent.

Patented June 27, 1916.

Application fled August 3, 1914. Serial No. 854,809.

To all whom it may concern:

Be it known that I, JOHN I. LOGAN, a citizen of the United States, residing at Chicago, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in Apparatus for Maturing and Bleaching Flour, of which the following is a specification. 7

My invention relates to apparatus for maturing and bleaching flour through the. agency of a gas which is brought into contact with the flour, while the latter is in suspension in the air, in an inclosed space or treating chamber.

The primary object of the invention 1s to provide an improved apparatus for carrying out flour treating processes such, for example, as the process patented to John A. VVesener, in Patents No'. 1,071,977, dated September 2, 1913, for method of improving the condition of flour, and No. 1,096,480, dated May 12, 1914, for method of maturing and bleaching flour, according to which processes a stored liquefied quantity of the agent is gradually vaporized and applied in minute regulated quantities mixed with large volumes of air, to the flour as the latter is showered through the treating chamber.

The present invention is not concerned with the method of mixing the gas with the air and applying it to the flour but relates solely to certain novel and improved arrangements for measuring and controlling the flow of gas to the point at which it is mixed with the air, whereby it is possible to obtain a closer and more accurate regulation of the flow of gas than has been possible heretofore and to insure the delivery of the gas to the flour at a rate which will be uniformly and accurately proportioned to the amount of flour passing through the treating chamber in a unit of time, even when the amount of gas utilized per unit period is extremely small; and, furthermore, to accomplish this without making it necessary to examine or make occasional tests of the treated flour as has been the practice heretofore. The difficulties in handling, controlling and accurately measuring the gases used for bleaching or maturing flour, for example, such gases as chlorin nitrosyl chloricl or mixtures of chlorm and nitrosyl chlorid, or other gaseous agents of like character and properties, are very considerable for the following, among other reasons. Gases such as these injuriously affect the packing of valves and are also corrosive of the metal parts of the apparatus into which they may come in contact particularly if the gas in question contains any appreciable amount of moisture. In consequence of this it has been found diflicult to obtain mechanism which will be constant and uniform in its operation for any considerable period of time, the corrosion and deterioration of the parts of the apparatus resulting in a gradually enlarging or clogging of the ducts and ports and otherwise modifying the intended operation so as to make accurate regulation extremely difiicult. The difficulty is enhanced by the fact that the ressures in the storage cylinders are relatively high and vary widely in range whereas the volumes of the gas delivered to the flour are usually very small for any given period of time. For example, the pressure in the storage cylinder when filled will vary quite considerably, according to the temperature of the room in which the apparatus is located, and this initial pressure, whatever it may be, will gradually decrease as the cylinder empties. A pound of the gas (supposing it to be made up of a mixture of chlorin and nitrosyl chlorid, as'in the process described in the application above referred to) will treat, on the average, six thousand pounds of flour.

In a very small plant, one in which the flour is treated at the rate of two barrels an hour, the apparatus for controlling and measuring the gas must be regulated down so as to deliver as little as one ounce of the gas per hour. Of course, the rate of flow will be greater in larger plants but in all cases the volumes delivered per unit of time are very small in comparison with the high pressure in the cylinders. If the rate of flow in any given instance is too rapid, not only is the gas wasted but there is danger that the flour will be overtreated and spoiled.

,The process of treating flour to mature and bleach it is of necessity carried on as an adjunct to the millin of the flour, the flour passing from the milling operation to the treating chamber before it is put into the barrels 01 sacks- A a g l ru e t e bleaching and maturing apparatus is in charge of an operator who knows nothing about the handling of powerful chemicals.

In view of all of the above considerations it is essential, if the best results are to be obtained, that apparatus for treating flour according to the processes above outlined should be provided with mechanism for controlling and measuring the volume of gas delivered to the flour per unit of time which will be constant in its operation, which can be readily adjusted to vary the volume of the gas in accordance with the amount of flour treated, which will be susceptible of a very close regulation to pass extremely small amounts of the gas per unit period, and which can be controlled and adjusted by the operator according to simple rules and regulations without necessitating the .customary periodical tests of the treated product which the operator is very likely not competent to perform and which, at best, import an undesirable element of uncertainty with the process.

A controlling andnieasuring apparatus having these requisites is shown in the accompanying drawings in which a preferred embodiment of myinvention is illustrated.

In the drawings Figure 1 designates a side elevation of a flour treating apparatus; Fig. 2, a fragmentary'plan view of the same, these two views showing a single treating chamber with the connections and controlling devices for a second treating chamber; Fig. 3,: a sectional view of the automatically operated, adjustable controlling and pressure reducing mechanism; Fig.

4, a sectional view of a preferred form of shut off valve. several of which valves are used in different places in the apparatus; Fig. 5, a sectional view taken on line 5-5 of Fig. 3; Fig. 6, a sectional view, on an enlarged scale, of the fitting shown at the bottom of Fig. 3; and Fig. 7, a similar view of a strainer fitting which is interposed in the gas duct leading to the controlling and measuring mechanism.

Like characters of reference designate like parts in the several figures of the drawings.

Referring to the drawings, A designates the flour treating chamber, the flour entering through a spout 25 and being showered down through the chamber.

B designates a storage cylinder adapted to contain, in liquefied form, a treating agent such as chlorin, nitrosyl chlorid, or a mixture of the two, these agents being active gases at atmospheric pressure and ordinary temperatures.

C designates a gas delivery pipe between which and the cylinder the measuring and controllin mechanism of my invention is interpose and D, an air pipe connected with the air manifold E which is kept filled with compressed air by the air compressor F.

The apparatus is preferably constructed with a plurality of treating chambers served with gas from a single cylinder, or from a plurality of cylinders connected with the gas manifold G, and supplied with compressed air from the same compressor F. I have shown only one treating chamber with the connections for another. The gas manifold Gr. leads to an automatically operating, adjustable controlling or pressure reducing device H, (Fig. 5) a strainer fitting I (Fig. 7) being interposed in the manifold and also a pressure ga e J. Interposed between the pressure refucing valve H and the delivery pipe C is a second pressure reducing device H which may be the same in construction as the device H, and beyond this a fitting K (Fi 6) provided with a thin non-corrosi le, preferably platinum disk 26 formed with a minute perforation or gas port 27. A pressure indicator L is arranged so as to record the gas pressure on the low pressure side of the pressure reducing device H',that is to say, the pressure exerted against the disk 26, the indication being preferably in terms of the flow of a unit volume of the gas through the gas port 27 per unit of time. A shut-off valve M (Fig. 4) is interposed between the gas manifold G and a short pipe section 28 to which the cylinder B is connected by means of the connecting pipe 29. A similar valve M is arranged between the manifold and short pipe section 28 for connection with another cylinder (not shown). A valve of like construction M is interposed between the automatic pressure reducing valves H and H.

The construction of the pressure reducing valves H, H is shown in Fig. 5. The valve H comprises a casing 30 closed at one end by a bonnet 31 which holds in place a pair of diaphragms 32, 32, the former being of copper and the latter, the one with which the gas comes into contact, of silver. A valve body 33 is secured to the diaphragm, being formed with a threaded stem 34 extending through a perforation in the diaphragm and screwed into a button 35 which provides an abutment for the end of a spiral spring 36, the opposite end of which bears against a movable block 37. The tension of the spring on the diaphragm 32 is adjusted by a screw 38 which bears against the block 37 and is provided with a hand grip 39. The valve body 33 carries a platinum disk 40 held against a packing disk 41 by a nut 42, the disk seating upon the end of a nozzle 43 fitted into a web 44 in the casing 30, a duct 45 being formed through the web and nozzle which communicates with the gas manifold G. The valve body 33 bears against a diaphragm 46 formed with openings 47 and with a central perforation through which extends a stud 48 which is formed on the valve body, the diaphragm being seated in a cap nut 49 engaging this end of the casing. The diaphragm 46 is held in place in said cap nut by a nut 50. The cap nut 49 is formed with a threaded opening normally closed by a plug 51. The stud 48 is threaded to receive a jam-nut 52 which may be screwed tightly against the diaphragm 46. The diaphragm 32 is preferably made of copper for the purpose of resiliency. This copper diaphragm is protected from corrosion by the gas by a thin silver diaphragm 32*.

The gas passes from duct 45 into the gas chamber 51 and then through the gas port of the shut-off valve M which will be more particularly described below, to the automatic pressure reducing device H which is constructed exactly like the pressure reducing device H so that it need not be particularly described.

The gas passing the second ressure reducing device flows through a pipe 52 into the duct 53 of the fitting K. This fitting is formed with a core 54 threaded to receive a tubular plug 55 in which is arranged the perforated disk 26 above referred to which is held in place by a nut 56. Straining screens 57 are preferably arranged in the plug 55 in advance of disk 26, these screens eing held in place and spaced apart by nuts 58, 59. The core 54 of fitting K is closed by a cap 60. The disk 26 is preferably made of platinum as thismetal is not corroded by the gases above mentioned. Preferably the disks 40 of the pressure reducing devices H, H are also made of platinum. The nozzles 43 are preferably made of silver. After the first attack this metal is not affected by the gases.

The gas passin through the minute gas port 27 in thedis flows through a duct 61 in the fitting K which communicates with an elbow 62 (Fig. 1) with which the delivery pipe C is connected. The device L for indicating the gas pressure onthe low pressure side of the pressure reducing valve H is preferably fitted into a tap 62 in the casing of the reducing valve H at a point corresponding to the point at which the gas manifold G is tapped into the casing of thereducing valve H. The indicating device L is preferably a ressure gage of the diaphragm type wit its actuatin diaphragm 64 made of copper or other exible metal protected on the under or gas side b a silver diaphragm 64. The dial 65 is gra uated to indicate the ounces per hour flowing through the gas port in disk 26. The strainer fitting I (Figs. 2 and7) is preferably formed with a central polygonal section 66 for theapplication of a wrench and with re e se threads at opposite ends in order that it may be screwed in between sections of the gas manifold G. The fitting is provided with a plurality of wire screens 67 separated by spacers 68 and held in position by a nut 69.

The shut-off valves M, M, M are preferably alike in construction comprising, 1n each case, a fitting 70 formed F 1g. 4) with a core 71 and with ducts 72, 73 running to said core. The port between the duct 72 and core 71 is closed by a conical valve 74 provided with a transverse pin 75, the ends of which are moved in vertical slots 76 and with a stem 77 having a left thread engaged by a spindle 78 provided with a hand grip 79. The lower end of the spindle 78 is formed with a boss .80 a trifle narrower than the counterbore 81 in the nut 82 which is interposed between the spindle and the portion of casing 70 surrounding said spindle. A packing 83 interposed between the washers 84, 85 surrounds the lower part of thestem 7 7 When the hand grip 79 is turned from right to left, assuming the valve 74 to be unseated, as shown in Fig. 4, the spindle first screws up on the threading of stem 77 until the boss 80 comes against the shoulder forming the end of counter-bore 81. After this the valve is screwed down until it closes the duct 72. In the same way when the valve is to be opened the hand grip must be turned enough to take up the lost motion between the spindle and the valve stem before the valve begins to open. By this arrangement the danger of the 0 erator opening the valve too wide, through lnadvertence, and thereb possibly overtreating the flour, is mimmized. The valve 74 closely fits the lower part of the bore 71 so as to effectually prevent the gas from coming into contact with and thereby corroding the packing and working parts of the device.

Operation: A cylinder B, filled with the liquefied gas, is connected with the gas manifold G either at 28 or 28' and, assuming the connection be at the point shown, valves M and M are open and valve M closed. The gas passes through the manifold, through the screens of strainer I, which serve-to strain out any solid or liquid matter, and into port 45 of the pressure reducing valve H. By screwing down stem 38 of this device the pressure of spring 36 on diaphragm 32 shifts the valve body 33 ,so as to move the disk 40 out of contact with nozzle 43. The gas from port 45 fills the gas chamber 51' and, by exerting pressure against diaphragm 32, balances the ressure of spring 36 on the other side 0 the diaphragm. If the pressure in the chamber 51 rises above the desired maximum, determined by the adjustment of the stem 38, the spring is overbalanced and duct 45 is closed until such time as the pressure on the low pressure side of the device shall have been reduced to the pressure desired. From the pressure reducing device H the gas flows into the pressure reducing valve H which is set so as to still further reduce the rate of flow of the gas through the apparatus. The latter device serves to keep a uniform pressure in the space between it and the platinum disk 26. As the orifice through the latter is very small a considerable gas pressure is accumulated back of the disk. The amount of gas passing through the orifice will vary in accordance with the pressure back of the disk and this, in turn, may be determined by an ad'ustment of the pres sure reducing device This device will act very sensitively and accurately because the gas pressure on the high pressure side is 'maintained approximately uniform, regardless of widely divergent pressures in thd cylinder B, by operation of the pressure reducing device The indicating device L is responsive to the pressure against the disk 26 and hence gives indication of the rate of flow through the gas port in the disk. As the disk is made of a metal which is not corroded by the gas the port 27 may be made very small without danger of its becoming either enlarged or clogged through the action of the gas. To further insure against clogging a second set of screens 57 is arranged in the gas duct just in advance of the disk.

The pressure gage J indicates the pressure in the cylinder B. Its function is primarily to show when the gas in the cylinder is so far exhausted as to require the cylinder to be replaced with a fresh one. The fresh cylinder is attached to the stub pipe 28, the valve M opened, valve M closed and the old cylinder removed. This can be done without interrupting the operation of the apparatus. The pressure reducing device H is ordinarily set so that with the pressure reducing device H inoperative, that is, wide open, the pressure back of disk 26 will be enough to carry the pointer of the indicator L to the higher graduations of the dial. The pressure reducing device H is then'adjusted to-obtain the delivery of a proper volume of gas per unit of time proportioned to the amount of the flour treated. To take a concrete example, if eight barrels of flour per hour are being passed through the treating chamber A the pressure reducing device H will be adjusted until the pointer of the indicator stands at the raduation number 4 which indicates that our ounces of the gas passes through the gas port 27 in disk 26 every hour, this amount being just the correct amount, it will be assumed, to treateight barrels of flour. By these arrangements the operator of the apparatus is not obliged to make any inspection or tests of the treated. flour for the purpose of checking up the quantity of gas being used. All he has to do is to set the pressure reducing devices so that the indicator L Will show a flow of gas proper for the treatment of the number of barrels per hour passing through the machine and, in addition to this, watch the gage J to see that a fresh cylinder of gas is connected to the gas manifold before the gas in the other cylinder is exhausted. The shut-off valve M is closed, it will be understood, when the treating chamber (not shown) corresponding to the chamber A, but on the other side of the machine, the connections to which are shown at the left hand side of Figs. 1 and 2, is being used and treating chamber A not in use.

While I have described my invention in a certain preferred embodiment, modifications might be made without departing from the principles of the invention. Therefore I do not wish to be understood as limiting the invention to the particular constructions, arrangements and devices shown and described except so far as such constructions, arrangements and devices are specifically made limitations in certain of the claims herein.

By the term cylinder as used in the claims I intend any suitable vessel for containing a high pressure gas.

I claim:

1. In apparatus of the character described, the combination with a storage cylinder for a treating agent gaseous at atmospheric pressure and ordinary temperatures, of a delivery pipe, and controlling and measuring mechanism having a gas duct connecting the delivery pipe with the cylinder and comprising a non-corrodible, thin disk arranged across said duct and formed with a ininute perforation, and means for maintaining a constant gas pressure against said disk.

2. In apparatus of the character de scribed, the combination with a storage cyl- I inder for a treating agent gaseous at atmospheric pressure and ordinary temperatures, of a delivery pipe, and controlling and measuring mechanism havin a gas duct connecting the delivery pipe wit the cylinder and comprising a non-corrodible, thin disk arranged across said duct and formed with a minute perforation, and means for maintaining a constant gas pressure against said disk, said means being adjustable to vary said pressure.

3 In apparatus of the character described, the combination with a storage cylinder for a treating agent gaseous at atmospheric pressure and ordinary temperatures, of a delivery pipe, and controlling and measuring'mechanism having a gas duct connecting the delivery pipe with the cylinder and comprising a non-corrodible, thin disk arranged across said duct and formed with a minute perforation, means for maintaining a constant gas pressure against said disk, said means being adjustable to vary said pressure, and means for indicating the gas pressure against said disk.

4. In apparatus of the character described, the combination with a storage cylinder for a treating agent gaseous at atmospheric pressure and ordinary temperatures, of a delivery pipe, and controlling and measuring mechanism having a gas duct connecting the delivery pipe with the cylinder and comprising a non-corrodible, thin disk arranged across said duct and formed with a minute perforation, adjustable pressure reducing apparatus between the cylinder and the disk for maintaining constant determinable pressures against the disk, and means for indicating the gas pressure against said disk in terms of the flow of a unit quantity of the gas through said perforation in a unit of time.

5. In apparatus of the character described, the combination with a storage cylinder for a treating agent gaseous at atmospheric pressure and ordinary temperatures of a delivery pipe, and controlling and measuring mechanism having a gas duct connecting the delivery pipe with the cylinder and comprising a non-corrodible thin disk arranged across said duct and formed with a minute perforation, and means for maintaining constant determinable pressures against said disk comprising a pair of automatic, manually adjustable, pressure reducing devices interposed between the cylinder and said disk.

6. In apparatus of the character described, the combination with a storage cylinder for a treating agent gaseous at atmospheric pressure and ordinary temperatures, of a delivery pipe, and controlling and measuring mechanism having a gas duct connecting the delivery pipe With the cylinder and comprising a non-corrodible thin disk arranged across said duct and formed with a minute perforation, means for maintaining constant determinable pressures against said disk comprising a pair of antomatic. manually adjustable, pressure redueing devices interposed between the cylinder and said disk, and means for indicating the gas pressure against said disk.

7. ln apparatus of the character decribed. the combination with a storage cylinder for a treating agent gaseous at atmosphrrir pressure and ordinary temperatures, of a delivery pipe, and controlling and measuring mechanism havin a gas duct connecting the delivery pipe witi the cylinder and comprising a non-corrodible thin disk arranged across said duct and formed with a minute perforation, means for maintaining constant determinable pressures again t said disk comprising a pair of antomatic, manually adjustable, pressure reducing devices interposed between the cylinder and said disk, and means for indicating the gas pressure against said disk in terms of the flow of a unit quantity of the gas through the perforation of the disk in a unit of time.

8. In apparatus of the character described, the combination with a treating chamber, a source of supply of gaseous treating agent under pressure and a connecting conduit between said source of suply and treating chamber; of means for controlling the flow of gas comprising a barrier across said conduit against which the gas pressure accumulates formed with a minute orifice, and means for maintaining a constant gas pressure against said barrier.

9. In apparatus of the character described, the combination with a treating chamber, a source of supply of gaseous treating agent under pressure and a connecting conduit between said source of supply and treating chamber; of means for controlling the flow of gas comprising a barrier across said conduit against which the gas pressure accumulates formed with a minute orifice, and means for maintaining a constant gas pressure against said barrier comprising a pair of automatically operating, adjustable, pressure reducing devices arranged tandem along the conduit in advance of said barrier.

10. In apparatus of the character described, the combination with a treating chamber, a source of supply of gaseous treating agent under pressure and a connecting conduit between said source of supply and treating chamber; of means for controlling the flow of gas comprising a barrier across said conduit against which the gas'pressure accumulates formed with a minute orifice, and means for maintaining a constant gas pressure against said barrier and for varying said pressure at will.

11. In apparatus of the character described, the combination with a treating chamber, a source of supply of gaseous treating agent under pressure and a con necting conduit between said source of supply and treating chamber; of means for controlling the flow of gas comprising a barrier across said conduit against which the gas pressure accumulates formed with a minute orilice, means for maintaining a constant gas pressure against said barrier and for varying said pressure at will, and means for indicating the pressure against said barrier.

12in apparatus of the character descri ed. the c mbination with a treating chamber, a source of supply of gaseous treating agent under pr s ure and a connecting conduit between said source of sup ply and treating chamber; of means for controlling the How of gas comprising a barrier across said conduit against which the gas pressure accumulates formed with a minute orifice, means for maintaining a constant gas pressure against said barrier and for varying said pressure at will, and means for indicating the pressure against said barrier in terms of the fiow of the unit quantity of the gas through said orifice in a unit of time.

13. In apparatus of the character described, the combination with a treating chamber, a source of supply of gaseous treating agent under pressure and a connecting conduit between said source of supply and treating chamber; of means for controlling the flow of gas comprising a barrier across said conduit against which the gas pressure accumulates formed of a thin sheet of metal with a minute orifice theretln'ough, and means for maintaining a constant gas pressure against said barrier.

14. In apparatus of the character described, the combination with a treating chamber, a source of supply of gaseous treating agent under pressure and a connecting conduit between said source of supply and treating chamber; of means for controlling the How of gas comprising a barrier formed with a minute orifice, which barrier is arranged across said conduit and of such character that said orifice is maintained at a constant effective cross sectional area, and means for maintaining a constant gas pressure against said barrier.

15. In apparatus of the character described, the combination with a treating 4t means for maintaining a constant gas pressure against said barrier.

16. In apparatus of the character described, the combination with a treating chamber, a source of supply of gaseous treating agent under pressure and a connecting conduit between said source of supply and treating chamber; of means for controlling the flow of gas comprising a barrier across said conduit against which the gas pressure accumulates formed with a minute orifice, means for maintaining a constant gas pressure against said barrier and for varying said pressure at will, and pressure gages to indicate the pressures on opposite sides of said pressure maintainmg means.

JOHN I. LOGAN. W'itnesses:

L. A. FALKENBERG, R. KUEHN.

Correction in Letters Patent No. 1,188,665.

necting conduit between said source of supply and treating chamber; of means for controlling the flow of gas comprising a barrier across said conduit against which the gas pressure accumulates formed with a minute orifice, means for maintaining a constant gas pressure against said barrier and for varying said pressure at will, and means for indicating the pressure against said barrier in terms of the-flow of the unit quantity of the gas through said orifice in a unit of time. I

13. In apparatus of the character described, the combination with a treating chamber, a source of supply of gaseous treating agent under pressure and a connecting conduit between said source of sup ply and treating chamber; of means for controlling the flow of gas comprising a barrier across said conduit against which the gas pressure accumulates formed of a thin sheet of metal with a minute orifice theretln'ough, and means for maintaining a constant gas pressure against said barrier.

14. In apparatus of the character described, the combination with a treating chamber, a source of supply of gaseous treating agent under pressure and a connecting conduit between said source of supply and treating chamber; of means for controlling the flow of gas comprising a. barrier formed with a minute orifice, which barrier is arranged across said conduit and of such character that said orifice is mainerence-numeral 50 read 51;

in the Patent Ofiice.

[SEAL] 1916, Upon the application of John I. Logan, of Chicago, Illinois,

ment in Apparatus for Maturing and Bleaching Flour,

tained at a constant efi'ective cross sectional area, and means for maintaining a constant gas pressure against said barrier.

15. In apparatus of the character described, the c'ombination, with a treating chamber, a source of supply of gaseous treating agent under pressure-and a connecting conduit between said source of supply and treating chamber; of means for controlling the flow of gas comprising a barrier across said conduit against which the gas pressure accumulates formed with a minute orifice, a screen across said conduit directly in advance of said barrier, and

means for maintaininga constant gas pressure against said barrier.

16. In apparatus of the character described, the combination with a treating chamber, a source of supply of gaseous treating agent under pressure and a connecting conduit between said source of sup mg means.

JOHN I. LOGAN. Witnesses a L. A. FALKENBERG, R. KUEI-IN.

It is hereby certified that in Letters Patent No. 1,188,665 granted June 27,.

for an improvean error appears in the printed specification requiring correction as follows: Page 3, line 126, for the refand that the said Letters Patent should be read with this correction therein that the same may conform to the record of the case Signed and sealed this 29th day of August, A. D.,1916.

F. W. H. CLAY,

Acting. Commissioner of Patents.

It is hereby certified that in Letters Patent No. 1,188,665, granted June 27,

1916, upon the application of John 1. Logan, of Chicago, Illinois, for an improvement in Apparatus for Maturing and Bleaching Flour, an error appears in the printed specification requiring correction as follows: Page 3, line 126, for the reference-numeral "50 read 51; and that the said Letters Patent should be read with this correction therein that the same may conform to the record of the case in the Patent Oflice.

Signed and sealed this 29th day of August, A. D. 1916.

F. W. H. CLAY,

Acting Commissioner of Patents.

[sEAn] 

